原生js实现可拖拽效果

效果图：

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>可拖拽特效</title>
 <style type="text/css">
 *{margin: 0;padding: 0;}
 .header{width:100%;height:30px;background:#036663;line-height:30px;color:#fff;text-indent:30px;}
 #demo{width:400px;height:300px;border:solid 5px #eee;box-shadow:0 0 5px #666;position:absolute;top:40%;left:40%;}
 #innerht{height:25px;background:#036663;border-bottom:solid 1px #369;color:#fff;text-indent:10px;cursor:move;}
 #close{float:right;cursor:pointer;}
 </style>
</head>
<body>
<div class="header">注册信息</div>
<div id="demo">
 <div id="innerht">注册信息（可拖拽）<span id="close">【关闭】</span></div>
 <div class="write"></div>
</div>
</body>
<script type="text/javascript">
 (function(window){
 function $(id){
  return document.getElementById(id);
 };
 // 获取对象
 var innerht = $("innerht"),demo = $("demo"),close = $("close");
 // 给innerht绑定鼠标事件
 innerht.onmousedown = function(event){
  // 解决event兼容问题
  var event = event || window.event;
  // 获取鼠标在页面上坐标
  var pageX = event.pageX || event.clientX + document.documentElement.scrollLeft;
  var pageY = event.pageY || event.clientY + document.documentElement.scrollTop;
  // 获取鼠标在innerht内部的坐标
  var innerX = pageX - demo.offsetLeft;
  var innerY = pageY - demo.offsetTop;
  // 给document绑定鼠标移动事件，防止鼠标快速滑动时滑出innerht
  document.onmousemove = function(event){
  var event = event || window.event;
  // 获取鼠标移动时的坐标
  var moveX = event.pageX || event.clientX + document.documentElement.scrollLeft;
  var moveY = event.pageY || event.clientY + document.documentElement.scrollTop;
  // 鼠标移动时demo的位置坐标
  var demoX = moveX - innerX ;
  var demoY = moveY - innerY ;
  // 鼠标移动时demo的位置坐标
  demo.style.left = demoX + "px";
  demo.style.top = demoY + "px";
  //清除选中文字
       window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
  }
 };
 // 鼠标抬起清除拖拽效果
 document.onmouseup = function(){
  document.onmousemove = null ;
 };
   // 点击关闭按钮关闭跟随框
   close.onclick = function(){
   this.parentNode.parentNode.style.display = "none";
   };
 })(window)
</script>
</html>

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